Metal-bo ring machine



. (N0 -5 2 Sheets-Sheet 1. J. WHEELOGK. METAL BORING MACHINE.

Patented 001;. 29, 1889.

Qw'VCmeo wo @ym. JOWM J. WHE'ELOGK.

Patented Oct. 29, 1889.

' UNITED. STATES PATENT OFFICE,

JEROME 'wnEELooK, OF woRoEsTER, MASSACHUSETTS.

METAL-BORING MACHINE,

SPECIFICATION forming part of Letters Patent No. 413,697, datedOctober29, 1889. Application filed April 8, 1889. $erial No; 306,415. (Nomodel.)

To all whom it may concern:

Be it known that I, JEROME WHEELooK, a citizen of the United States,residing in Worcester, in the county of Worcester and Commonwealth ofMassachusetts, have invented certain new and useful Improvements inMetal-Boring Machines, of which the following, in connection with theaccompanying drawings, is a specification sufficiently clear anddescriptive to enable those skilled in the art to which my inventionbelongs to make and use the same.

My invention has for its object to provide a boring-bar, which, first,is adapted to bore holes of a diameter almost as small as that of theboring-bar itself; which, secondly, will bore taper holes uniformly,andwhich, thirdly, may easily be adjusted so as to bore taperin g holesatany desired pitch; and my invention consists in several new featuresof construction, as will be fully described, and-particularly pointedout in the claims.

7 several figures, in which- A is the boring-bar, which is provided withthe slotted chamber B, adapted to receive the tool-carrier O, whichfirmly holds the cuttingtool and lifter, the construction of which hasbeen fully explained in Letters Patent granted to me onthe 2d day ofMay, 1882, No. 257,422.

The tool-carrier O is caused to move longitudinally within the tubularchamber B by the screw E, one end of which finds its bearings in theplug F, screwed into the chamber 13, and having a recess a, whichreceives the check-nuts b b, the innermost b of which rests against theshoulder c provided on the plug F, while the periphery of nuts b 19forms the wearing-surface of the screw E. At its other end the screw Efinds-its bearing in the collar G, having a screw-threaded hub d,whereby the collar Gr is firmly secured to the boring-bar A. It will benoticed that the center of the chamber B is nearer to the center of theboring-bar at this end, so that a tapered hole is obtained, even if theboringbar proper is placed centrally in relation to the core in thecasting to be bored.

The method of supporting the boring-bar in position may be varied, and Ihave represented the bar suspended at one end by the center H, such asordinarily used, while its other end is provided with the special collarI, provided with teeth 6 on its periphery and adapted to be placedWithin a suitable bearing, all substantially as described in my patentabove referred to, and as is clearly illustrated in .Fig. 5, in which Ldesignates a globular bearing adapted to'receive the collar I, while atthe other end of the bar is placed the bracket M, containing thescrew-threaded center H, which is prevented from turning by thecheck-nut Z.

The boring-bar is shown as boring out the valve-seat N of thecylinder-casting O, and the end bearings of the bar as held together andfirmly in position by means of the tierods P, passing through lugs onthe bearings L and M. The center H enters the screw J in the collar G,said screw J having a fine thread and being provided with the slot f forits entire length to receive the end of the check-screw K, which servesto bind the screw J and at the same time answers the purpose of aregister-pin, so that the screw J will always assume the same positionwith that portion of its periphery which is countersunk (see g g 9,Fig. 1) toward the center H. The screw J is placed near to the side ofthe collar G, which is cut away to form a slot h to allow the center IIto enter any one of the countersunk portions at g.

It will be readily understood that by setting the boring-bar A so thatthe center H enters either of the countersunk portions of the screw J agreater or smaller pitch of the hole to be bored is obtained, and thisis ac complished as follows: Byturning the binder-screw K out of theslot f the support-screw J may be turned with a screw-driver in eitherdirection, whereby the position of the countersunk portions relativelyto the center of the bar will be changed, and as the binderscrew K isscrewed into the slot f again the screwJ will come to a proper positionso that the countersunk portions will face the center H. By these meansa very free and close adjustment may be made, as each rotation on partof the screw J will cause an offset over the previous position of anamount equal to that of the pitch of the screw J.

The mechanism for feeding the tool along within the bar A may be of anywell-known construction, the one shown in the drawings consisting,substantially, of a four-fingered button L, adapted to be engaged duringits planet motion by an arm or projection on the rigid part of theapparatus, and as the tool projects through the slot in the bar A a keyfor preventing the rotation of the cutter-head O is obviated and abetter result is obtained, inasmuch as the tool itself rests against afirm support at a point near the place where the cutting is done.

\Vhat I claim as new, and desire to secure by Letters Patent, is asfollows:

1. The combination of a boring-bar having a tubular chamber the axis ofwhich is at an angle with the axis of the bar, and a cutterhead adaptedto slide within said chamber, with means, substantially as described,for imparting a sliding motion to said cutterhead, as and for thepurpose set forth.

2. The combination of aboring-bar having a tubular chamber the-axis ofwhich is at an angle with the axis of the bar, a cutter-head slidingwithin said chamber, and means, substantially as described,,forimparting a sliding movement to said cutter-head, with a supportingscrew near one end of said bar, whereby the angle between the chamberand the axis of the bore may be varied, substantially as and for thepurpose set forth.

3. The combination of a boring-bar having a tubular chamber, acutter-head sliding within said chamber, means,'substantially asdescribed, for imparting a sliding movement to said cutter-head, and asupporting-screw whereby the position of the axis of the chamberrelatively to the axis of the bore may be varied, with a check-screwwhereby said supporting-screw is secured and uniformly held in positionrelatively to the center which supports the bar, substantially as andfor the purpose set forth.

7 JEROME WHEELOCK.

Witnesses:

CHAS. F. SCHMELZ, JAMES D. MONA-HAN.

